Is there any machine that can automatically engrave stone stamps?

I have been engaged in the engraving industry for nearly 20 years.

The machines for engraving stone seals currently on the market mainly include the following categories:

A: Mechanical type

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It is the kind that can be operated automatically after designing the stamp on the computer and then outputting instructions

1: Laser engraving machine

Advantages: high precision,

Disadvantages: The depth is not enough. If you want to carve a depth of 1 mm, a 2 cm * 2 cm seal will probably have to be carved several times

2: Sandblasting engraving machine

Advantages: Fast processing speed

Disadvantages: The accuracy is not very ideal, there is dust, and auxiliary tools such as cutting machines and plastic films need to be added

3: Computer engraving machine:

Advantages: High precision, fast speed

Disadvantages: relatively high price

B: Manual type

1: Electric engraving machine or The pneumatic engraving machine (looks like a very thick pen) is equipped with various grinding heads

Advantages: low cost, light weight, easy to carry

Disadvantages: difficult to operate, skilled It takes a long time to learn carving

2: Traditional carving knife, commonly known as chisel

This technology has been eliminated and is not recommended.